body{
    font-family: 'Times New Roman', Times, serif;
    background-color: lightsteelblue;
}
.header{
    text-align: center;
    width: 80%;
    background-color: rgb(212, 218, 224);
    margin: auto;
    padding-top: 20px;
    height: 125px;

    border-radius: 10px;
    border-bottom: 2px solid grey;
}
.container{
    width:80%;
    margin:auto;
}
.nav{
    margin-top: 3px;
    border-radius: 10px;
    height: 40px; 
    background-color: lightseagreen;
    border-bottom:2px solid grey
}
.nav ul{
    padding:0px;
    margin:0px;
    
}
.nav li{
    border-radius: 10px;
    color: whitesmoke;
    text-align: center;
    font-size:18px;
    font-family: Arial, Helvetica, sans-serif;
    list-style-type: none;
    width: 25%;
    float: left;
    padding:6px 0px;

}
.nav li:hover{
    background-color: lightpink;
    color: black;
}
.nav li:visited{
    background-color: whitesmoke;
    color: red;
}